Research On SDN Load Balancing Based On Switch Migration And Multi-Path Routing

With the rapid development of big data,cloud computing and other computer network technologies,the data generated by network traffic shows an explosive growth trend.The traditional network is facing challenges such as improper management of underlying resources and poor scalability.In recent years,software defined network(SDN)is the mainstream technology of future network development.Its combination with Open Flow south interface protocol realizes the separation of data plane and control plane.The features of programmable and fine-grained flow control of SDN controller can also meet more network service requirements and effectively solve the rigidity problem of traditional network.However,the development of SDN has also brought new technical problems such as load balancing,security and consistency.Among all the challenges,SDN load balancing has become a hot research topic at the present stage.At the same time,due to the growing demand of SDN network and the diversity of network applications,the scale of SDN network is transforming from single controller network to multi-controller network.In this background and research status,the research of this paper focuses on the load balancing of SDN network.The corresponding load balancing strategy is designed from two application scenarios of single controller and multiple controller respectively.The main work and innovations of this paper are as follows:(1)This paper firstly elaborated the development status of technologies related to SDN and Open Flow.Including the combination and application of the two technologies,the components such as relevant controller and network simulator software.This paper discusses the research progress on the load balancing of SDN single controller network and multi-controller network as well.Therefore,it is determined that the research direction of this paper is to design dynamic load balancing strategy based on switch migration and multi-path routing load balancing strategy based on traffic distribution tendency respectively for single controller and multi-controller network of SDN.(2)For multiple controller SDN network load balancing problem,this paper proposes a switch migration load balancing scheme.The scheme firstly uses the dynamic load information acquisition algorithm(DIA)to collect the load information of each SDN controller,in order to detect overload controller that requires load balancing.DIA algorithm can dynamically adjust the time interval of load information acquisition according to the change of controller load,and reduce the communication consumption.Then the migration domain and migration switch selection algorithm(MSS)were defined to select the SDN switch to be migrated and the target controller to be migrated.This scheme can effectively solve the problem of overload of single controller in multi-domain SDN by transferring switch management authority.Simulation results show that the load balancing scheme can effectively balance the load of each controller and improve the throughput rate of switch.(3)In view of the load balancing problem faced by the SDN network of a single controller,this paper proposes a load balancing scheme of multi-path routing based on traffic distribution propensity.Firstly,the multi-path load information to be collected by the controller is defined and the flow distribution tendency(FDP)is defined based on the load information.Then FDP value was applied to Open Flow group table technology,and multi-path parallel transmission of network traffic was realized with the help of bucket of Select group table.Simulation result shows that this scheme can effectively increase the data packet transmission of all available paths,reduce the load of single path in SDN network,and realize load balancing based on multi-path routing.